This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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In anatomy, surrounded with a walled depression; circumvallate. [Rare.]—

In zoöl., cupped; cup-shaped.

"In the adult the union of the anterior and posterior parts of the tongue is marked by the V-shaped sulcus terminalis, the apex of which is at the foramen cecum, while the two limbs run lateralward and forward, parallel to, but a little behind, the vallate papillæ."